Core catching device



IN VEN TOR F. L.. scoTT ET AL CORE CATCHING DEVICE Filed Aug. 19, 195o May 17, l932 "Imam/7 FLOYD L. coTT H T. BAGGETT AUM BY am l ATTORNEY Patented May 17, 193112 vUrn-TED STATES' PATENT OFFICE L. SCOTT .AND HENRY T. BAAGGETT, 0F HOUSTON, TEXAS, .ASSIGNORS TO HUGHES TOOL COMPANY, OF HOUSTON, TEXAS, A CORPORATION OF TEXAS com: GATCHING DEVICE application mea August 1e, 1930. serial 110.476,300.

Our invention relates to devices for engaging and breaking oi the corein well drilling when obtaining a sample of the formation bein drilled.

. e have as anobject to mount the coreengaging dogs firmly and securely without the use of springs or similar means tending to clog up.

We also aim to provide a securing means for the core engagin dogs which will no become loosened and ail to function.

It is also an object to provide a relief for y catcher may be` of any desired construction.

We have shown a soft formation drill including a head 1 of tubular formation, tapereddownwardly on its outer periphery. p It has an upper shoulder 2 and an interiorly threaded soc et 3 to engage the shank 4 of the special drill collar 5. The shoulder 1 has an annular channel 6" arranged to receiveA the flushing fluid from passages 7 .in the drill collar and y direct it into passages 8 through the bit head to thet forward side of the cutting blades 9.

There are three or more cutting blades extending laterallyfrom the head, and extending slightly in advance thereof.

i) uAbove the head and between the shoulder 'f 2 and the lower end of the drill collar is a v wear plate 10. Said plate is a washerservingto take up the wear from the flushing fluid. It has openings therein registering with the passages 7 in thehead. AWhen the erosion of ilus ing fluid oni` this washerv is g'eataenough to cause leakage it may be rep ace q The drill collar has an upwardly extending sleeve 11. A core barrel 12 is screwedto the inner lower end of the sleeve and the .interior of the sleeve is spaced from the barrel above their point of engagement. AdJacent the lower end of the drill collar, a plurality of openings 13 are formed to` allow the projec- A tion therethrough of the core engaging dogs 14. 'l'he upper walls of these openings are squared oil", but the lower walls are beveled downwardly and outwardl The sleeve 11 ofthe drill collar fits within an outer drill sleeve 15 which connects with the'drill stem 16 atl its upper end and/tele-y scopes over the sleeve 11 at its lower end. As

seen in Fig. 2, the drive sleeve, has downwardly extending arms 17 fitting within grooves in the outer surface of the drill collar and serving as a. support for the core engaging dogs 14 at their lower ends.

The drill collar and drive sleeve aresecured together by radial pins 19 upon the drill collar tting within slots 20 in the drive sleeve. The pins' are screwed within'openings in the drill collar land have diametrical grooves 21 in the outer ends to receive locking pins 22 which lie within grooves in the outer facek of the drive sleeve to prevent un- `screwing ofthe pins 19. The walls of the grooves in which the pins 22 are tted are peened over to prevent removal of this locking means. The drive sleeve. is allowed a a longitudinal movement over the sleeve 11 limited by the length of the slots 20.

The upper end of the drill collar'is recessed slightly on its inner face at 23 to receive a packing sleeve 24 of hard but expansible material which is received in a recess in the drive sleeve atits` upper-end. f This packin sleeve serves to. prevent loss of flushin fluid between the sleeves 11 and 15 in use.

plurality of vents 25 are providedthrough ,within recesses on tliemeeting faces of the drive sleeve and drill collar. The dogs4 yare pivoted to the blocks at 28. Their upper ends are beveledto slide through the openings 13 in the drill collar and to fill said openings when in vnormal position. The blocks are heldv against removal on the 'ends of arms 17 by screws 27, the heads 29 of which are adapted to be upset into a lateral recess 30 in the outer end of the arm 17 as seen in Fig. 2.'

When the drill is in operation, the parts will appear as shown in Fig. 1. The dogs will be retracted and the packing sleeve 24 will lit closely in its seat. When a core of suicient length has been obtained, the operator will stop rotation and pull upwardly upon the drill stem and drive collar. The

lpressure of the umps and the weightof the 24 which, without the relief rovide b the opening 25, would tend to un uly ex an and rupture the packing sleeve.y But uid mayenter from the outside preventing the vacouum tending to forin and allowing free move# ment of the sleeves relative to each other.

Ely securing the blocks 26 and the Adogs lir scribed, the action of the dogs is a ositive one not liable to fail in use. When t e dogs v are to be removed, the heads of the screws 27 collar thereon, a drive sleeve litting over saidcollar, a packing sleeve between the upper end of said collar and said drive sleeve, said packin sleeve being slidable relative to said drive s eeve, means to allow a limited longitudinal play of said drive sleeve on said drill collar, core engaging means actuated by said longitudinal play, and means to relieve the partial vacuum tending to form outside said packing sleeve when said drive sleeve is drawn u wardly.

In testlmony whereof, we hereunto aflix our signatures, this the 11th day of August, A.

y in position by vthe screws 27' as de- ,-1

will be cut away by a chisel sufficiently to lal- .low its unscrewing.

What we claim as new is 1. A core drill including a drill collar, av l drill bit thereon, said drill collar having an upwardly extending sleeve thereon, a drive sleeve telesco ing over saiddrill collar, an interior packmg sleeve at the upper end of said drill collar a vent connected with the outer side of'said packin sleeve, and core engaglngl means actuate by the relative -movement of said collar and drive sleeve.

2. A core drill including a drill collar, a drill bit thereon said drill collar havin an upwardly extending sleeve thereon, rive sleeve telescoping over said drill collar, an

interior packing sleeve at the upper end of equalize the pressure on both sides of said packing sleeve, and core engaging dogs on said drive sleeve actuated y the upward .movement of s'aid drive sleeve relative to said drill collar.

3. A core drill including a drill collar, a drill bit thereon, a drive sleeve telescopically engaging said Idrill collar, means to prevent relatlve rotation and to limit lon tudinal movement between said collar and said sleeve, core engaging dogs, blocks on which said dogs are mounted, screws securing said blocks @tgsaid sleeve, and means to prevent unscrewing fms'ad screws. y 4. A core drill including a bit, a= drill said drill collar, means to approximately FLOYD L. SCOTT. HENRY T. BAGGETT. 

